My gut feel is that the difficulty with cold stiff grease would be more in moving it through the hand pump than it would be moving through the bearing cavity. In any event regardless of temperature it would flow in the direction of least resistance which I would think would be out the front as Dexter intended rather than pushing a rear seal out. In our case daytime temps are currently in the 60's or 70's which should not have any adverse effect on the flow of grease.
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